Windows 10: Pc randomly restarts or shutsdown after few minutes of start

I have a pc build of below specs been using it about a year:Ryzen 5 3400gMsi b550m pro vdh wifi I know that this mobo doesn't officially support the cpu but 1.5 years back I faced a problem with my old mobo b450m so the company replaced me with current one as they didn't had the same one in stock saying it works with the processor and it worked too so I didn't bother muchAdata XPG 8gb 3200 MHz 2 sticks total 16 gb ramCorsair vs500 PSUOne week ago I dis-assembled it for cleaning since after it started with the problem I didn't physically damage any components but after reassembling it rand

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Computer shutsdown randomly

My computer started to shutdown randomly again. Then it keeps on restarting and shutting down - like a loop. I have changed PSU as well thinking it might help but it didn't.

Can anyone help as it's quite annoying that my PC randomly shutsdown and then it goes in loop and I can't use it. I have to unplug the power and wait for sometime before I can use it.

Need help to resolve this, it's so annoying...

 

Computer shutsdown randomly

Alright, as per title my pc justs shutsdown randomly and then comes back ON again. It has happened few times now, I have checked all cables and wiring, everything seems to be in place as it should be. Any guesses what could be the cause of it?

Cheers

 

Computer shutsdown randomly

Could it be overheating? Have you checked the fan and processor for dust build up?